Therapeutic organometallic compounds containing antimony and sulfur



United States Patent M THERAPEUTIC ORGAN ONIETALLIC COMPOUNDS CONTAINING ANTIMONY AND SULFUR Ernst A. H. Friedheim, New York, N. Y.

No Drawing. Original application January 28, 1947, SerialNo. 724,925, now Patent No. 2,659,723, dated November 17, 1953. Divided andthis application September 10, 1953, Serial No. 379,465

4 Claims. (Cl. 260-446) This invention relates to organometallic compounds containing radicals of arsenic or antimony and has particular relation to organometallic compounds of this type in which the radicals of arsenic or antimony are linked to sulfur-containing organic radicals. The invention also relates to methods of preparing such compounds.

The main object of the present invention consists in providing organometallic compounds containing radicals of arsenic or antimony, which show valuable therapeutical properties.

Another object of my present invention is to provide organometallic compounds of the above-mentioned type which yield injectable, stable solutions.

Other objects and the advantages of the invention will be apparent from the following specification and claims which show, by Way of example, some preferred embodiments of the invention.

Therapeutically useful organometallic compounds of arsenic and antimony in which the arsenic atom or antimony atom is linked to form the grouping \S and in which each of the two sulfur atoms is part of an individual SR radical (mercaptan residue) have been known. These compounds correspond to the general formula Ar.Me= (SR)2 (I) wherein Ar is an organic radical, Me stands for an atom of trivalent arsenic orantimony, and SR is the residue of an organic sulfhydril compound.

The therapeutically useful organometallic compounds, according to the present invention, contain radicals of trivalent arsenic and antimony in which the arsenic atom or antimony atom is-linked to two sulfur atoms which are substituents of the same organic radical, said organometallic compounds corresponding to the general formula I have found that compounds of the above shown general structure (II) have outstanding chemotherapeutic, for example, trypanocidal activity, combined with relatively low toxicity. Furthermore, such compounds are distinguished by their stability. According to the nature of the dimercapto compound used, the final product may have special properties of solubility which are highly desirable from the angle of practical medicine. For example, the combination of certain phenylarsenic and phenylantimony compounds with 2,3-dimercaptopropanol leads to compounds yielding stable solutions in propylene glycol, while their combination with 2,3-dimercaptopropi0nic acid leads to Water-soluble compounds.

The general method for the preparation of compounds forming the subject of this invention consists of mixing a suitable dimerc'apto compound with dispersion or solu tion of an organometallic compound containing trivalent 2,772,303 Patented Nov. 27, 1956 antimony or arsenic linked to a carbon atom. The combination takes place, as a rule, rapidly at room temperature according to the following scheme:

In the above scheme R is an organic radical and MeX stands for a radical of trivalent arsenic. or antimony, WhlCl'l is capable of reacting with the dithiol used. For example, --MeX may stand for and antimony thiomalate radicals.

The organometallic compound may also be put to the reaction in the pentavalent state, provided conditions are such as to bring about in the reaction mixture a reduction to the trivalent state. This may be obtained by using an appropriate excess of the dimercapto compound which will act as a reducing agent.

If an aqueous reaction medium is used in a reaction with a dimercapto compound, it is preferable to adjust the pH of the reaction mixture to 6 to 8. The reaction may also be carried out in a non-aqueous medium, for example in alcoholic or glycol solution.

Another procedure to obtain compounds corresponding to the present invention consists in first forming a compound of the formula R.Me

and further reacting the compound thus obtained with another suitable organic compound. For example a compound of the formula may be first prepared in the manner described in detail hereinafter and the compound formed may be reacted with a suitable 1,3,5-triazine halogen derivative to form a compound corresponding to the formula N S-GH (IJHZOH The compounds forming the object of this invention have the following group properties:

The nitroprusside reaction for SH groups is negative or only very faintly positive under classical condition, i. e. in the presence of sodium carbonate at a pH of about 8, but becomes positive on addition of caustic alkali, such as NaOH, i. e. at a pH of at least 9-10.

The procedure for the preparation of the compounds embodying the present invention will become more apparent from the following examples.

Example l.36.4 millimols of sodium p-melaminylphenylstibonate (I) are suspended in ml. of water, and to this suspension 218 millimols of ammonium thicglycolate, i. e. approximately 6 equivalents based onthe amount of (I), are added in concentrated (50-58%) aqueous solution. The reaction mixtureis stirred at room temperature for IOminutes to form a nearly clear, slightly brownish solution having a pH of about 9.

The pH is adjusted to 6.5-7 by addition of 27 mlv of 20% aqueous acetic acid. The reaction mixture is filtered and the clear filtrate is diluted with 200 ml. of water. 40 millimols, i. e. 10% excess of the theory, of 2,3-dimercaptopropanol (II), dissolved in 20 ml. of ethanol, are added with rapid stirring to the reaction mixture. A white precipitate is formed immediately, filtered off, washed with 500 ml. of water, 250 ml. of ethanol and 250 ml. of ether. The washed precipitate is dried in vacuo over sulfuric acid. The yield amounts to 92% of the theory.

The product thus obtained in insoluble in water, alcohol and ether. It is soluble in propylene glycol to at least 10%. This solution is stable to heating at a temperature of 80 C. for at least 3 weeks. The product sinters at 175 C. and melts with decomposition between 175 and 200 C. The aqueous suspension of the substance reduces Fehling solution slowly on heating. The nitroprusside reaction for SH groups is negative to faintly positive in the presence of sodium carbonate, i. e. at a pH of about 8, but becomes strongly positive on addition of 10% aqueous sodium hydroxide, i. e. at a pH of at least 9-10.

The maximum tolerated dose in mice, i. p., of the substance administered in propylene glycol solution, amounts to 0.03 g./kg., while the minimum curative dose, i. p., in the T. equiperdum infection of the mouse amounts to 0.0006 g./kg., in propylene glycol solution. Thus, the therapeutic index amounts to 50.

Formation of the above described substance apparently takes place according to the following scheme:

N ONa N OH (H) om-cn-crnon S-GH,

SCH.CH2OH HS.CH2.COONH4 The same product (IH) may also be obtained by converting compound (I) into the corresponding derivative containing the Sb=O radical by reduction and reacting an aqueous suspension of the reduced compound at substantially neutral reaction with the necessary amount of compound II.

Example 2. A mol of the hydrochloride of 3-amino- 4-hydroxyphenyl arsenoxide are dissolved in 48 ml. of water and enough sodium carbonate to form a clear solution having a pH of 6.0. With rapid stirring 1.1 ml. of 2,3-dimercapto-propanol (11 millirnols) are added. A whitish, gluey precipitate is formed, which changes to a granular white powder upon adjusting the pH to 7.5 and continuing stirring for half an hour. The precipitate is filtered off and washed abundantly with distilled water.

4 The product thus obtained has the formula SCH2 S-CHCHzOH It is insoluble in water, readily soluble in cold acetone and cold ethanol, and sparingly soluble in cold methanol. It can be recrystallized from boiling methyl alcohol. In order to eifect such recrystallization, it is dissolved in ml. of boiling methanol, and the slightly turbid solution is filtered. On cooling the clear filtrate, a snowwhite crystalline precipitate of (IV) is formed, filtered otf, washed with methanol and ether, and dried in vacuo. The compound as Well as its hydrochloride salt is soluble in propylene glycol. Such solution of the salt is distinguished by good stability.

Example 3. mol of 3-(2',4'-diamino-l',3',5'-triazinyl 6') amino 4 hydroxyphenylarsendichloride of the formula N N l prepared as described in my U. S. Patent No. 2,386,204, is suspended in 50 times its weight of water with theaddition of A mols of sodium carbonate and to the reaction mixture 11 ml. (110 millimols) of 2,3-dimercaptopropanol are added with vigorous stirring. Stirring of the reaction mixture is continued for hour. The resulting precipitate is filtered oif, washed with water and dried in vacuo.

The product formed has the structural formula It is insoluble in cold water, and soluble in propylene glycol.

Example 4.- i mol of p-aminophenyl arsendichloride of the structural formula I-t yields injectalble solutions in propylene glycol and is soluble in dilute hydrochloric acid.

Example 5.- mol. of 3-acetyl-amino-4-hydroxyphenyl-arsenoxide of the formula AsO is suspended in 60 times its weight of water, and to the reaction mixture 11 ml. (41 10 millimols) of 2,3-dimercaptopropanol, dissolved in methanol, are added with vigorous stirring. Stirring of the reaction mixture is continued for 60 minutes. A light tan precipitate is formed, which is filtered off and washed with water.

The reaction product formed has the structural [formula S-CELCHrOH NH.COCH:

The starting material used in this example is prepared by reduction of 3-acetylamino-4hydroxyphenylarsonic acid according to classical methods with sulfur dioxide in the presence of catalytic quantities of hydriodic acid.

Example 6.- A mol. of 2-hydroxy-4-acetylaminobenzene-arsendichloride of the formula NH-OOCHa is suspended in 50 times its weight of water, and to the suspension mols of sodium carbonate and 11 ml. (110 jmillimols) of 2,3-dimercaptoprop1anol are added with rapid stirring. The resulting precipitate is filtered oif, washed with water and dried in vacuo.

The reaction product thus formed has the structural formula S-OHr As S-CH.OHaOH NILOOCH: The compound is insoluble in water, soluble in propylene glycol, ethylene glycol, glacial acetic acid, and hot ethanol.

Example 7 .--30 millimols of the monosodium salt of 4-carbamidoaphenylarsonic acid of the formula ASO H.Na

NHC ONH:

are suspended in 400 ml. of water, and a concentrated (50%) aqueous solution of 180 millimols of ammonium thioglycolate is added. The reaction mixture is stirred in an inert atmosphere at a temperature of 80 C., for 60 minutes. To the resulting solution are added dropwise with rapid stirring 33 millimols of 2,3-dirnercapto propanol. A white precipitate separates from the solution, which is filtered off, washed with water, and dried in vacuo.

The compound formed corresponds to the formula S -C H:

As\ i S- IELOHgOH NH.C ONE;

The compound is insoluble in water, chloroform and ether, soluble in propylene glycol. i

Example 8.-36.4 millimols of sodium N-phenylglycine-amide-p-arsonate of the formula ASOaH.N8

. NELCHqOONH:

NELCHaCONH:

It is insoluble in water and soluble in propylene glycol. Example 9.-36.4 millimols of the monosodium salt of 4-hydroxypropylaminophenyl-l-arsonic acid of the are added to a solution of 218 millimols of ammonium thioglycolate in 500 m1. of water. The reaction mixture is heated at with stirring in an inert atmosphere for 45 minutes. To the resulting solution 40 millimols of 2,3-dimercaptopropanol, dissolved in 20 ml. of ethanol, are added with vigorous stirring. A precipitate is formed, which is filtered ofi, washed with water and dried in vacuo.

This precipitate consists of a compound of the following formula:

\ /As Nrucmucrnon Hie-s If in the above example instead of the sodium salt of 4-hydroxypropylaminophenyl-l-arsonic acid, an equivalent amount of the monosodium salt of 4-hydroxyethylaminophenyl-l-arsonic acid is used under otherwise similar conditions, a compound corresponding to the following formula is obtained:

H2C-S As-Omiomcm011 HOH2C.HOS/

The product is insoluble in water. It is soluble in propylene glycol and hot ethanol.

Example 10.-To a 5% aqueous solution containing 50 millimols of sodium p.-aminophenylstibonate of the formula a 20% aqueous solution of 300 millimols of potassium thioglycolate are added at room temperature with rapid stirring, which is continued for about 1 hour. To the resulting clear solution 55 millimols of 2,3-dimercaptopropanol, dissolved in 20 ml. of ethanol are added with constant vigorous stirring. The reaction product separates from thesolution inform of a brownish gummy precipitate which is filtered off, and, washed with water. The compound formed: has the formula It is insoluble in water but soluble in propylene glycol and sulfuric acid.

Example 11.-T a 2% aqueous solution containing 40 millimols of the sodium a'cetylaminophenylstibonate of the formula v I CHa.CO.NH.CsH4.SbO (OI-I). (ONa) a 55% aqueous solution containing 240 millimols of ammonium thioglycolate are added at room temperature with rapid stirring. The stirring is continued, for 30 minutes. To the resulting solution 45 millimols of 2,3-dimercaptopropanol are added with vigorous stirring. A precipitate is formed, which is filtered OE and washed with water. The compound formed has the formula S-CIELCHzOH It is insoluble in water. Injectable solutions may be prepared by dissolving the product in warm propylene glycol.

A compound of the formula S-CH.CH:OH

may be obtained by a procedure substantially identical with that described above, if an equivalent amount of sodium 3-chloro-4-acetylaminophenylstibonate is substituted for the monosodium-p-acetylaminophenylstibonate in the above example.

Example 12.-36.4 millomols of the disodium salt of s-diphenyl-carbamide-4,4'-distibonic acid, of the formula are added to a solution of 218 millimols of sodium thioglycolate in 1 liter of water with rapid stirring at room temperature. The stirring is continued for 30 minutes. To the solution thus formed, 80 millimols of 2,3-dimercaptopropanol are added dropwise with rapid stirring. A precipitate is formed which is filtered off and Washed with water.

The reaction product formed has the formula The product is insoluble in water, but soluble in propylene glycol,

. Example 13..To 1nol of p-aminophenyl-arsenoxide of the formula n.N r.=O

suspended in 1 liter of water are added 110 millimols 0f 2,3-dirnercaptopropanol dissolved in 50 ml. of ethanol with rapid stirring. Stirring is continued for 1 hour. The resulting product has the formula /SCH2 S--CH.CH2OH This product, which is identical with that obtained in Example 4, is washed with water and is then reacted with an aqueous suspension of mol of 2,4-diamino-6- chloro-l,3,5-triazine with stirring at a temperature of C. at a pH of 2-4. The resulting reaction product corresponds to the formula It is insoluble in water, cold ethanol and methanol, but soluble in propylene glycol.

Example 14. A mol of a compound corresponding to the formula IITH:

prepared in the manner described in my U. S. Patent No. 2,422,724 patented June 24, 1947, is dissolved in water and to the solution millimols of 2,3-dimercaptopropanol' are added with rapid stirring at ordinary room temperature. Stirring is continued for 20 minutes and the precipitate formed is filtered off, and washed with water. The compound thus formed is identical with, that obtained in Example 13. I

Example 15 mol of p-hydroxyphenyl arsenoxide of the structural formula is suspended in 50 times its weight of water and 11 ml. (110 millimo'ls) of 2,3-dimercaptopropanol are added to the solution with vigorous stirring. After 50 minutes of continued stirring the compound formed is filtered OE and washed with water. The reaction product, which .is soluble in propylene glycol, corresponds to the. formula Example ]6.-36.4 millimols of sodium p-melaminylphenylstibonate are suspended in 100 ml. of water and to this solution 218 millimols of ammonium thioglycolate are added in a 55% aqueous solution. The reaction mixture is stirred at room temperature for 15 minutes to form a solution having a pH of about 9. The pH is adjusted to 6.5-7 by the addition of aqueous acetic. acid, the reaction mixture is filtered and the clear filtrate is diluted with 200 ml. of water. 40 millimols of 1,2-propanedithiol are now added to the solution with rapid stirring. A white precipitate is formed which is filtered ofi, washed with water, and dried in vacuo over concentrated sulfuric acid.

In the above example, equivalent amounts of ethanedithiol (SH.CH;.CH2SH) or 2,3-butane dithiol may be substituted for the 1,2-propanedithiol. The dithiols mentioned in this example may be prepared according to the methods described in the U. S. Patent 2,402,643, granted to W. A. Lazier et a1.

Example 17. A mol of the hydrochloride of 3- amino-4-hydroxyphenylarsenoxide and the requisite amount of sodium carbonate are dissolved in 48 ml. of water to form a clear solution having a pH of 6.0. To the solution 11 millimols of 1,2-propanedithiol are added with rapid stirring, and stirring is continued for half an hour. A white precipitate is formed which is filtered oil and washed with distilled water.

By substituting equivalent amounts of 1,2-ethanedithiol or 2,3-butanedithiol for the 1,2 propanedithiol used in this example, and proceeding in a substantially identical manner, corresponding derivatives containing ethanedithiol and 2,3-butanedithiol, respectively, are obtained.

Example 18.To an aqueous suspension of 36.4 millimols of sodium p-melaminylphenylstibonate in 100 ml. of water, a 55% aqueous solution of 218 millimols of ammonium thioglycolate is added with stirring for about minutes. The pH of the solution is adjusted to 6.57 by the addition of dilute aqueous acetic acid. The reaction mixture is filtered and the clear filtrate is diluted with 200 ml. of water. of 1,3-dithioglycerol are added with rapid stirring. A whitish precipitate is formed which is filtered off, washed with water, and dried in vacuo over concentrated sulfuric acid.

Example 19.To a solution consisting of 4 mol. of the hydrochloride of 3-amino-4-hydroxyphenylarsenoxide and the requisite amount of sodium carbonate to yield a pH of 6 in 480 m1. of water, 110 millimols of l,3-dithioglycerol are added with vigorous stirring. A gluey precipitate is formed which changes to a white powder upon adjusting the pH to 7.5 and continued stirring for half an hour. The precipitate is filtered off, washed with water and dried preferably under vacuum in the presence of concentrated sulfuric acid.

Example 20.-To a 5% aqueous solution containing 36.4 millimols of sodium-p-aminophenylstibonate, a aqueous solution of 218 millimols of potassium thioglycolate are added at room temperature with rapid stirring which is continued for about minutes. millimols of 1,2-propanedithiol are added with vigorous stirring. The resulting precipitate is filtered off, washed with water, and dried under vacuum in the presence of concentrated sulfuric acid.

Analogous compounds may be obtained by substituting equivalent amounts of 1,2-ethanedithiol or 2,3-butanedithiol for the 1,2-propanedithiol used in the above example.

Example 2].-100 millimols of p-aminophenyl arsendichloride are suspended .in 1 liter of water and 200 millimols of sodium carbonate and 110 millimols of 1,2-propanedithiol are added with vigorous stirring which is continued for minutes. The reaction product formed is filtered off, washed with water, and dried under vacuum.

Analogous compounds may be obtained by proceeding in substantially the same manner as set forth in the above example, by substituting an equivalent amount of 1,2ethanedithiol or 2,3-butanedithiol for the 1,2-propanedithi01 used.

Example 22.-36.4 millimols of sodium p-melaminylphenylstibonate are suspended in 100 ml. of water and to this suspension 218 millimols of potassium thioglycolate are added with stirring in 20% aqueous solution. Stirring is continued for 10 minutes and the pH of the reaction mixture is then adjusted to 6.5-7 by the addition of dilute aqueous acetic acid. After filtration, the reaction mixture is diluted with 300 ml. of water and to the diluted solu- To the diluted solution 40 millimols tion 40 millimols of 1,2-dimercaptobenzcne, dissolved in 10 The washed precipitate is dried in vacuo over concentrated sulfuric acid.

Example 23.To an aqueous solution consisting of 36.4 millimols of sodium p-melaminy1phenylstibonate and ml. of water, 218 millimols of potassium thioglycolate are added in 20% aqueous solution and the reaction mix ture is stirred at room temperature for 10 minutes. The pH is adjusted to 6.57 by the addition of dilute aqueous acetic acid. The reaction mixture is filtered, the filtrate is diluted with 300 ml. of water and to the diluted liquid 40 millimols of dithio-o-xylylene glycol of the formula CsH4(CHzSH)2, dissolved in alcohol, are added with rapid stirring. A whitish precipitate is formed which is filtered off, washed with water, and dried .in vacuo over concentrated sulfuric acid.

Example 24. To a neutral solution prepared by dis solving 100 millimols of the hydrochloride of 3-amino-4- hydroxyphenylarsenoxide and the requisite amount of sodium carbonate in 480 ml. of water, millimols of 1,2- dimercaptobenzene, dissolved in ethyl alcohol, are added with rapid stirring, whereupon a whitish precipitate is formed. Stirring is continued for about half an hour. The precipitate is filtered off, washed with distilled water, and dried, preferably in vacuo in the presence of concentrated sulfuric acid.

Example 25.T0 a neutral solution prepared by dissolving 100 millimols of the hydrochloride of 3-amino-4- hydroxyphenyl arsenoxide and the requisite amount of sodium carbonate in 480 ml. of water, 110 millimols of dithio-o-xylylene glycol, dissolved in ethyl alcohol, are added with rapid stirring, whereupon a whitish precipitate is formed. Stirring is continued for about half an hour. The precipitate is filtered 01f, washed with distilled water and dried, preferably in vacuo in the presence of concentrated sulfuric acid.

Example 26.-10 millimols of sodium p-melaminylphenylstibonate are dissolved in 10 parts by weight of propylene glycol. 22 millimols of 2,3-dimercaptopropanol are added. The resulting solution is poured with stirring into 15 volumes of water. The precipitate which is formed is centrifuged oil, washed with water and alcohol and dried in vacuo. The reaction product is identical with the one obtained by the method of Example 1.

For practical therapeutic purposes, it is not necessary to isolate the compound but the solution described above containing in propylene glycol as a solvent the reaction product of sodium p-melaminyl-phenylstibonate and 2,3- dimercaptopropanol in a molar ratio of 1 mol. of the former to not less than 2 mols. of the latter, can be used directly for parenteral treatment.

Example 2 7.-20 millimols of sodium p-acetylaminophenylsti'bonate are added to a solution of 100 millimols of ammonium thioglycolate in 250 ml. of water. The reaction mixture is stirred for 15 minutes giving a clear solution of pH 9. Au alcoholic solution of 22 millimols of dithiopentaerythritol, prepared according to U. S. Patent No. 2,402,665, is added dropwise with rapid stirring. The resulting precipitate is filtered off, washed with water, and dried in vacuo. The product has the formula:

S CH2 CHzOH 0113c O.NHS{ o v s our oaion it is insoluble in water but soluble in propylene glycol.

Example 28.To a suspension of 36.4 millimols sodium p-melaminylphenylstibonate in 300 ml. of water are added with stirring 218 millimols ammonium thioglycolate. Stirring is continued for 15 minutes. The pH of the resulting solution is adjusted to 65-7 by the addition of aqueous acetic acid. The reaction mixture is clarified by filtration and to the filtrate are added 40 millimols of 2,3-dimercaptopropionic acid. A white precipitate is formed which is filtered off, washed with Water, ethanol and ether, and is dried in vacuo. product has the structure:

The

It is insoluble in water, alcohol and ether. It is soluble in water upon addition of sodium carbonate to yield clear, injectable solutions.

Example 29. A mol. of a compound corresponding to the formula N N Nmii JJ-NH-O-AMS onto 0 0K S-CH is dissolved in Water and to the resulting solution 110 millimols of 2,3-dimercaptopropyl ethyl ether are added with vigorous stirring. A white precipitate forms immediately. It is filtered off, washed with water, and dried in vacuo. The product has the structure:

It is insoluble in ether, chloroform, and benzene. It is soluble in water to form injectable solutions.

For practical purposes it is not necessary to isolate the product, but the solution described above containing, in an aqueous medium, the reaction product of p-aminophenylarsenoxide and an equivalent amount of 2,3-dimercaptopropanol-glucoside is suitable for parenteral administration.

Example 31 .To a 5% aqueous solution containing 50 millimols of sodium p-aminophenylstibonate, a 20% aqueous solution of 300 millimols of potassium thioglycolate are added at room temperature With rapid stirring which is continued for an hour. To the resulting solution, 55 inillimols of 1,3-disulfhydrylbenzene dissolved in ethanol are added with constant vigorous stirring. The reaction product separates from the solution, is filtered oif and washed with water.

Example 32.-0.1 mol of sodium arsanilate is dissolved in 50 parts its weight of water. 22 millimols of 2,3- dimercaptopropanol are added, and the reaction mixture is stirred for 40 minutes at 80 in an inert atmosphere. Stirring is continued for 1 hour at room temperature. The precipitate formed is centrifuged off, Washed with water and recrystallized out of boiling methanol. The resulting white crystalline product corresponds to the formula:

It is insoluble in cold water, soluble in hot alcohol, dilute hydrochloric acid and propylene glycol.

As shown in the above examples, the present invention may be applied to various organometallic compounds and various dithiols in order to obtain new compounds embodying the present invention.

The preferred dithiol used in carrying out the present invention is 2,3-dimercaptopropanol. However, other dithiols of aliphatic or aromatic compounds, particularly aliphatic and aromatic orthodithiols, may also be used.

Furthermore, in the above described examples, in which thioglycolates are first reacted with the organornetallic compounds, and the reaction products formed are further reacted with dithiols, other thio-acid derivatives, such as thiolactates, may be substituted for the thioglycolates.

It is to be understood that in the present specification and claims the term amino radical" is used to include --NH2 radicals as well as the above disclosed substituted amino radicals. The abbreviation i. p. is used in this specification to denote intra-p'eritoneal.

It will be aparent from the above description that my invention is not limited to the specific compounds and process steps described above and may be carried out with various modifications without departing from the scope of the invention as defined in the appended claims.

Reference is made to my co-pending applications, Serial No. 724,925, filed January 28, 1947, now Patent No. 2,659,723, November 17, 1953, and Serial No. 231,430, filed June 13, 1951, now Patent No. 2,662,079, December 8, 1953, of which this is a division.

What is claimed is:

1. As a new therapeutically active product, organometallic compound consisting of S-CH:

wherein R is a radical of the group consisting of S-CH.OH:OE

3. A new'organometallic compound of the formula omoomrQ-sp S-GH.QH2OH 4. A new organornetallic compound of the formula S-CH2 References Cited in the file of this patent UNITED STATES PATENTS Clemence Feb. 24, 1953 Friedheim Nov. 17, 195.3 

1. AS A NEW THERAPEUTICALLY ACTIVE PRODUCT, ORGANOMETALLIC COMPOUND CONSISTING OF 